Multiple choice

A visually challenged student, has to perform a lab test to detect the presence of acid in a given solution. The acid-base indicator preferred by him him will be:

  1. Blue litmus

  2. Clove oil

  3. Red cabbage extract

  4. Hibiscus extract

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Clove oil is an olfactory indicator, meaning its smell changes in the presence of acids or bases. This allows a visually challenged student to detect the presence of an acid by the change in scent.